IMT - MINES ALES - IMT - MINES ALES (IMT - Mines Ales École des Mines
Site de Clavières : 6 avenue de Clavières, 30319 Alès Cedex
Site de Croupillac : Rue Jules Renard, 30100 Alès
Site de Pau : Hélioparc (bâtiment Einstein 1), 2 avenue du Président-Pierre-Angot, 64053 Pau Cedex 9 - France)
IMT - MINES ALES - IMT - MINES ALES (IMT - Mines Ales École des Mines
Site de Clavières : 6 avenue de Clavières, 30319 Alès Cedex
Site de Croupillac : Rue Jules Renard, 30100 Alès
Site de Pau : Hélioparc (bâtiment Einstein 1), 2 avenue du Président-Pierre-Angot, 64053 Pau Cedex 9 - France)
Abstract : In this study coatings of kaolin and talc particles were successfully applied on the surface of polyamide 12 powder intended for laser sintering (LS). Microscopic observations revealed that using carboxymethyl cellulose (CMC) as surface modifier for fillers led to a better coverage of polymer grains with a surface coverage between 6 and 16% as a function of filler type and content. Differential scanning calorimetry measurements showed that the addition of talc and kaolin led to an increase in the crystallization temperature of PA12, but at the expense of processability. Process parameters were optimized in order to manufacture LS samples with the different coated powders. Fire behavior assessed by cone calorimetry showed that the use of CMC resulted in a significant decrease in the peak of heat release rate depending on the filler type and content. This behavior can be partially explained by an interaction between CMC, fillers and polymer, with the formation of amide linkage between carboxyl part of CMC and amine end groups of polyamide, resulting in an increase in the complex viscosity of materials.
https://hal.mines-ales.fr/hal-03518682 Contributor : Administrateur IMT - Mines AlèsConnect in order to contact the contributor Submitted on : Wednesday, March 2, 2022 - 10:58:07 AM Last modification on : Monday, June 27, 2022 - 3:02:51 AM Long-term archiving on: : Tuesday, May 31, 2022 - 6:38:22 PM
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Marcos Batistella, Ouassila Kadri, Arnaud Regazzi, Monica Francesca Pucci, J. Lopez-Cuesta, et al.. Laser sintering of coated polyamide 12: a new way to improve flammability. Journal of Materials Science, Springer Verlag, 2022, 57 (1), pp.739-754. ⟨10.1007/s10853-021-06621-7⟩. ⟨hal-03518682⟩